Apple uses this strategy to sell more of their products to the same market

Apple uses this strategy to sell more of their products to the same market. By doing so, they increase their income rate by selling side products separately from their main products for example in 2004 the product designers started reselling keyboards after they were removed from the merchandise for re-design. When they were brought back, apple started selling the keyboards, mouse, and speakers on the side.
Another way apple made a lot of money by using market penetration was when they had a student offer. For every computer purchased, the student would receive an iPod touch which is 8GB. This went in their favor because it increased their income by 34%.